Lighting device



FIG. 1 is a top and front perspective view of a lighting device showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof.

The broken lines showing the environment in some of the figures are for illustrative purpose only and form no part of the claimed design. 

CLAIM The ornamental design for a lighting device, as shown and described. 